An assembly that handles waste discharge without connecting to the water supply is referred to as what?

The term that accurately describes an assembly handling waste discharge without a connection to the water supply is "Plumbing Appurtenance." This term encompasses various components used in plumbing systems which may include fixtures, valves, and other devices designed to manage the movement of wastewater.

Plumbing appurtenances can function independently of a water supply because their primary role is to facilitate the disposal of waste, rather than to utilize water for functioning, which is typical for other plumbing fixtures. This concept is essential in plumbing as it recognizes the diversity in systems designed to effectively manage liquid waste removal without necessitating direct water connections.

In contrast, the other options do not accurately encapsulate this specific function. A drainage system typically involves a network designed to convey wastewater but may include components connected to a water supply. A waste fixture generally refers to a device, like a toilet or sink, that directly receives waste and is reliant on water for operation. A storage container does not inherently manage waste discharge; instead, it simply serves as a receptacle for storing materials, which may or may not be related to plumbing activities.